Registration Mail to Admin

[nicodya]

Hi, I want to add a custom field in my email registration for Admin.

Example: user can select from 2 options in form registration... Customer or Installer.

I want to show in Admin mail registration this custom field ("usertype").

Ho can I insert this string on my php? mail_html_regvendor.php

this is my website: http://www.nicodia.it/accesso/profilo.html

the field is the first you see.

Thankssss